package org.apache.maven.repository;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.ArrayList;
import java.util.List;

/**
 * MetadataGraph node - as it's a directed graph - holds adjacency lists for incident and exident
 * nodes
 *
 * @author Oleg Gusakov
 *
 */
public class MetadataGraphNode {
  /** node payload */
  MavenArtifactMetadata metadata;

  /** nodes, incident to this (depend on me) */
  List<MetadataGraphNode> inNodes;

  /** nodes, exident to this (I depend on) */
  List<MetadataGraphNode> exNodes;

  public MetadataGraphNode() {
    inNodes = new ArrayList<MetadataGraphNode>(4);
    exNodes = new ArrayList<MetadataGraphNode>(8);
  }

  public MetadataGraphNode(MavenArtifactMetadata metadata) {
    this();
    this.metadata = metadata;
  }

  public MetadataGraphNode addIncident(MetadataGraphNode node) {
    inNodes.add(node);
    return this;
  }

  public MetadataGraphNode addExident(MetadataGraphNode node) {
    exNodes.add(node);
    return this;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }

    if (MetadataGraphNode.class.isAssignableFrom(obj.getClass())) {
      MetadataGraphNode node2 = (MetadataGraphNode) obj;

      if (node2.metadata == null) {
        return metadata == null;
      }

      return metadata != null && metadata.toString().equals(node2.metadata.toString());
    } else {
      return super.equals(obj);
    }
  }

  @Override
  public int hashCode() {
    if (metadata == null) {
      return super.hashCode();
    }

    return metadata.toString().hashCode();
  }
}
